The breaking capacity reaches 187 kA at 240 V, 121 kA at 415/440 V, 79 kA at 500 V, and 5.1 kA at 690 V — so it can interrupt high fault currents on a 240 V secondary side, but the 690 V rating is modest and governs selectivity planning on higher-voltage distribution.
The 250 A rating holds flat up to 50 °C ambient; above that it derates to 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C.
